Bump django from 2.1.2 to 2.2.13

Bumps [django](https://github.com/django/django) from 2.1.2 to 2.2.13.
- [Release notes](https://github.com/django/django/releases)
- [Commits](https://github.com/django/django/compare/2.1.2...2.2.13

)

Signed-off-by: dependabot[bot] <support@github.com>

requirements.txt

@@ -6,37 +6,37 @@
 #
 alabaster==0.7.12         # via oic
 aniso8601==3.0.2          # via graphene
-arrow==0.12.1
+arrow==0.12.1             # via -r requirements.in
 asn1crypto==0.24.0        # via cryptography
 beaker==1.10.0            # via oic
-bleach==3.0.2
+bleach==3.0.2             # via -r requirements.in
 certifi==2018.10.15       # via requests
 cffi==1.11.5              # via cryptography
 chardet==3.0.4            # via requests
 cryptography==2.3.1       # via pyopenssl
-django-elasticsearch-dsl==0.5.0
-django-extensions==2.1.3
-django==2.1.2
-dsnparse==0.1.12
-elasticsearch-dsl==6.1.0
+django-elasticsearch-dsl==0.5.0  # via -r requirements.in
+django-extensions==2.1.3  # via -r requirements.in
+django==2.2.13            # via -r requirements.in, graphene-django
+dsnparse==0.1.12          # via -r requirements.in
+elasticsearch-dsl==6.1.0  # via -r requirements.in, django-elasticsearch-dsl
 elasticsearch==6.3.1      # via elasticsearch-dsl
 future==0.16.0            # via oic, pyjwkest
-graphene-django==2.2.0
-graphene==2.1.3
+graphene-django==2.2.0    # via -r requirements.in
+graphene==2.1.3           # via -r requirements.in, graphene-django
 graphql-core==2.1         # via graphene, graphene-django, graphql-relay
 graphql-relay==0.4.5      # via graphene
 idna==2.7                 # via cryptography, requests
 ipaddress==1.0.22         # via elasticsearch-dsl
-iso8601==0.1.12
+iso8601==0.1.12           # via -r requirements.in
 mako==1.0.7               # via oic
 markupsafe==1.0           # via mako
-oic==0.14.0
+oic==0.14.0               # via -r requirements.in
 promise==2.2.1            # via graphene, graphene-django, graphql-core, graphql-relay
-psycopg2-binary==2.7.5
+psycopg2-binary==2.7.5    # via -r requirements.in
 pycparser==2.19           # via cffi
 pycryptodomex==3.6.6      # via oic, pyjwkest
 pyjwkest==1.4.0           # via oic
-pyjwt==1.6.4
+pyjwt==1.6.4              # via -r requirements.in
 pyopenssl==18.0.0         # via oic
 python-dateutil==2.7.3    # via arrow, elasticsearch-dsl
 pytz==2018.5              # via django
@@ -44,5 +44,6 @@ requests==2.20.0          # via oic, pyjwkest
 rx==1.6.1                 # via graphql-core
 singledispatch==3.4.0.3   # via graphene-django
 six==1.11.0               # via bleach, cryptography, django-extensions, elasticsearch-dsl, graphene, graphene-django, graphql-core, graphql-relay, oic, promise, pyjwkest, pyopenssl, python-dateutil, singledispatch
+sqlparse==0.3.1           # via django
 urllib3==1.24             # via elasticsearch, requests
 webencodings==0.5.1       # via bleach